I stayed at the DoubleTree DTD in August of 2005. I had complimentary breakfast deal and a really good rate. The hotel itself is not the newest on the block but it was still nice. The room gave me plus two kids sufficient room to get around without bumping into each other. Kids liked the pool area. There were always people but never overly crowding. The beds are to die for...I believe the best sleep I've had in quite awhile.
The bus system is run by Downtown Disney services and makes stops at several hotels along the strip. That said, we never more then 15 minutes for the bus to arrive which was going to our destination. There are certain times of the day when the buses can get a little crowded. But so can Disney buses. Ususally this only happens in the early mornings or after the parks close. We generally did not leave the hotel until after 9:30 am so it was not much of an issue for us. I couple of cons about the bus service. You do have to walk a little farther away than the Disney stops. One evening a bus broke down or something but we had to wait for about 35 min after the parked closed to get picked up. All the while thunderstorms threatened our wait. We were not happy campers that evening. We did notice a couple of bugs on the bus ( I am not a bug person at all) but just moved seats and keep watch until we could get off.
Hope this helps!